jquery 图片本地预览

时间：2023-03-09 20:11:00
jquery 图片本地预览

uploadPreview.js

/*

*名称:图片上传本地预览插件 v1.1

*介绍:基于JQUERY扩展,图片上传预览插件 目前兼容浏览器(IE 谷歌 火狐) 不支持safari

*参数说明: Img:图片ID;Width:预览宽度;Height:预览高度;ImgType:支持文件类型;Callback:选择文件显示图片后回调方法;

*使用方法:

<div>

<img id="ImgPr" width="120" height="120" /></div>

<input type="file" id="up" />

把需要进行预览的IMG标签外 套一个DIV 然后给上传控件ID给予uploadPreview事件

$("#up").uploadPreview({ Img: "ImgPr", Width: 120, Height: 120, ImgType: ["gif", "jpeg", "jpg", "bmp", "png"], Callback: function () { }});

*/

jQuery.fn.extend({

    uploadPreview: function (opts) {

        var _self = this,

            _this = $(this);

        opts = jQuery.extend({

            Img: "ImgPr",

            Width: 100,

            Height: 100,

            ImgType: ["gif", "jpeg", "jpg", "bmp", "png"],

            Callback: function () {}

        }, opts || {});

        _self.getObjectURL = function (file) {

            var url = null;

            if (window.createObjectURL != undefined) {

                url = window.createObjectURL(file)

            } else if (window.URL != undefined) {

                url = window.URL.createObjectURL(file)

            } else if (window.webkitURL != undefined) {

                url = window.webkitURL.createObjectURL(file)

            }

            return url

        };

        _this.change(function () {

            if (this.value) {

                if (!RegExp("\.(" + opts.ImgType.join("|") + ")$", "i").test(this.value.toLowerCase())) {

                    alert("选择文件错误,图片类型必须是" + opts.ImgType.join("，") + "中的一种");

                    this.value = "";

                    return false

                }

                if ($.browser.msie) {

                    try {

                        $("#" + opts.Img).attr('src', _self.getObjectURL(this.files[0]))

                    } catch (e) {

                        var src = "";

                        var obj = $("#" + opts.Img);

                        var div = obj.parent("div")[0];

                        _self.select();

                        if (top != self) {

                            window.parent.document.body.focus()

                        } else {

                            _self.blur()

                        }

                        src = document.selection.createRange().text;

                        document.selection.empty();

                        obj.hide();

                        obj.parent("div").css({

                            'filter': 'progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)',

                            'width': opts.Width + 'px',

                            'height': opts.Height + 'px'

                        });

                        div.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = src

                    }

                } else {

                    $("#" + opts.Img).attr('src', _self.getObjectURL(this.files[0]))

                }

                opts.Callback()

            }

        })

    }

});

　　

jsp

<%@ page language="java" contentType="text/html; charset=utf-8"

	pageEncoding="utf-8"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<link rel="stylesheet" href="css/common.css">

   <link rel="stylesheet" href="css/main.css">

   <script type="text/javascript" src="js/jquery.min.js"></script>

   <script src="js/uploadPreview.js" type="text/javascript"></script>

<style type="text/css">

	.upimage{

		padding: 6px 10px;

		height: 35px;

		line-height: 20px;

		position: relative;

		cursor: pointer;

		color: #888;

		background: #fafafa;

		border: 1px solid #ddd;

		border-radius: 4px;

		overflow: hidden;

		display: inline-block;

		float: left;

		margin-left: 10px;

		margin-top: 39px;

	}

</style>

	function choose(){

		$("#file").show().click();

		$("#file").uploadPreview({ Img: "ImgPr", Width: 120, Height: 120 });

	 }

</script>

</head>

<body>

		<form action="${pageContext.request.contextPath}/update.do" enctype="multipart/form-data"

		method="post">

		<table>

			<tr>

					<td  class="td_right">图片：</td>

					<td class="">

						<div style="float: left;width: 120px;">

							<img id="ImgPr" src="${serverPath}/${zySubscription.imgurl}" width="120" height="120" />

						</div>

						<input type="button" value="上传图片" onclick="choose();" class="upimage"/>

						<div hidden="true">

							<input type="file" name="file" id="file" hidden="true"/><font color="red">${msg}</font>

						</div>

	                 </td>

				</tr>

		</table>

	</form>

</body>

</html>

　　

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